George w



' @hitch tateslatwt @ffice GEORGE wjwHEELEE. or NEW FAIRFIELD, AND HIRAM I. STEVENS, orv

EETHEL, CONNECTICUT.

Letters Patent No. 72,250, dated December 1T, 1867,l

IMPROVED MARBLE-CUTTING MACHINE.

T0 'ALL WHOM IT MAY CONOEBN:

Be it known that we, GEORGE W. WHEELER, oi` New Fairfield, and HIRAM I. STEVENS, of Bethel, in the county ofFairiield, and State of Connecticut, have invented a new and useful Improvement in Marble-Cutting Machines; and we do hereby declare the following to bca full, clear, and exact description of the same, reference being had to the accompanying drawings, in .whichl Figure I represents a side elevation,

Figure 2 n. plan, and y Figure 3 a rear view of the vertical frame of our machine. v

Oui' invention is an improved manner of constructing machines for sawing marble and other stones, so that blocks may be made tapering in form. v

Our machine is constructed as follows: A-is a platform madeot timber, of strength to sustain heavy blocks of stone' while being Sawn, and is fitted with the common devices` for holding the same in position when their weight is not suilicient to keep them stationary. At suitable places on the platform, and across it, arelplaced the vertical frames B B, which contain the'guides of the saw-frames M Mr These frames B B are made as-follows, and of either -wood or iron, though we prefer the latter: The lower and upper portions C C are made of two pieces, long enough to extend across the platform, and of such vertical section as represented in fig. 1, at C, each piece having a groove' cut on its inner face from end to end. i They'are placed sutiiciently near to receive and retain the slide D, and at each end a small portion of the inner faces is cut away to form a. seat for the posts E E. After placing the slides D in the greoveformed' by these two pieces, the ends of the posts E are placed in their respective seats, and the frame-is fastened either bybolts or screws. The slides in the lower`V portion of the frame arejoined to their opposite slides inthe upper part, each pair by two rolling guides, F F,

at-sueh distances apart as to receive between them and allow to move freely the sawframes M M, and when it is desired to more these slides in the grooves which retain. them, the screws a avmay be loosened, which will allow the two pieces forming C C to separate, when therslides can be placed at the required points, and the whole tightened so`that they will be retained there. The frames B Bruay then be set up' across the platform A, at proper distances apart for the saws to play between, where they'arve firmly secured by bolts passing up through the platform between the two parts e c, having screw-nuts on thc upper ends, or by any othersuitable devices. To the top ofthe posts E, at each end ot' the frames B B, are seeured,'by a screw-bolt, the beams H H, connecting the frames together. Between these beams H H, and connecting them together near the ends, are the rodsb b, whose ends are secured so that they cannot turn, and midway between them sthe bar d. The rodsb b have upon them guides e e, one for cach saw-frame, which are capable of adjustment laterally, sind are set at any desired points vby the set-screwsff. The bar Z is square, with cylindrical ends, which rest'in corresponding holes in the beams H H, and one end projects beyond the beam and has secured to it the pulley I. On this bal" rl are the slides gig, one for each saw-frame, which are free to move either way, as may be required, and to these slides :1re fastened the ends of the two cords or chains L L, which pass in opposite directions over the guides e e, and then downward to the ends ot' the saw-frames. To the pulley I is also attached a cord or chain, K, which passes backwards .over the pulley J, which is secured near the rear end ot` the beam H, and downward'to the platform. In order to raise the saw-frames up clear of the stone, the attendant pulls downward on. the rope K, which turns the bar rl, and the slides-upon it, thereby winding up the ropes L L, and raising the saw-frames to any-desired height. l

The saw-frames M are-made of iron, and of theform shown in the drawings, having at each end two projecting arms, L 71., which move between the rolling guides F, and keep the saw always in the same vertical plane. .These saw-frames are attached by the connecting-rods N N to the cccentrics O 0 en the shaft Q, whichv is turned by a pulley-band on the drum P, or by gearing of some othendescription. lThe leccentric-strap R is constructed with a T-head projecting from one side, and this head is -made somewhat broader than the width of the strap, and furnishes means of an adju'stableconnection with the connecting-rod, which is sometimes necesvsary to bring the conneeting-rodand saw-frame more nearly in a straight line, when the saw is cutting on a line oblique to the axis of the main shaft. Cranks may be formed in the shaft, to be used instead of eccentrica,

if desired, the operation being the same, and not requiring :my change in the construction of the other parts, Having thus described our invention, its construction and mode of operation, what We claim as new, is 1. The frame B, constructed as described, so that the roller-guides muy be adjusted as described.

2. The adjustable coupling T, as set forth.

GEO. W. WHEELER, [n 5.]

HIRAM I. STEVENSQU.

Witnesses:

PETER STARR, GEORGE R. Menem. 

